pinning their ears back 

Taken from what a dog does before it attacks. It means to charge or attack with full ferocity.

The quarterback is in trouble now. With no running game, they have to pass every play so the defensive line are pinning their ears back and rushing the quarterback.

pinning their ears back by PriorKnowledge September 22, 2010

pinning their ears back 

To have one’s ears pinned back means to be severely scolded or to be bested in an athletic contest, soundly. The idiom have one’s ears pinned back is an American phrase that came into use in the mid-1800s. Its origin is uncertain. Some say it is derived from the sport of wrestling and some say it is somehow linked to the emotional state of an animal with its ears pinned back, though both of these explanations seem rather dubious. It may be more likely that the phrase have one’s ears pinned back is related to some sort of physical punishment that has gone out of common use. Related terms are has one’s ears pinned back, had one’s ears pinned back and having one’s ears pinned back.

pinning their ears back "He's about to have his ears pinned back" Paul Drake, to Perry Mason from the TV series "Perry Mason"

pinning their ears back by NTBC March 4, 2020